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Derivative Financial Instruments and Fair Value Measurements (Notional Amounts) (Details)
bu in Thousands
Mar. 31, 2018
bu
bu
lots
Dec. 30, 2017
lots
Corn [Member]    
Derivative [Line Items]    
Inventories Carried At Market Unit 235,992  
Soybean [Member]    
Derivative [Line Items]    
Inventories Carried At Market Unit 292,019  
Not Designated as Hedging Instrument [Member] | Future And Forward Contracts [Member] | Cocoa [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount | lots 716 299
Not Designated as Hedging Instrument [Member] | Future And Forward Purchase Contracts [Member] | Corn [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 799  
Not Designated as Hedging Instrument [Member] | Future And Forward Purchase Contracts [Member] | Soybean [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 393  
Not Designated as Hedging Instrument [Member] | Future And Forward Sale Contracts [Member] | Corn [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount (326)  
Not Designated as Hedging Instrument [Member] | Future And Forward Sale Contracts [Member] | Soybean [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount (899)  
Not Designated as Hedging Instrument [Member] | Future [Member] | Corn [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount (750)  
Not Designated as Hedging Instrument [Member] | Future [Member] | Soybean [Member]    
Derivative [Line Items]    
Derivative, Nonmonetary Notional Amount 210